石墨毡电极预处理模拟邻甲酚废水.pdf

2014年第34卷第4期
ENVIRONMENTAL PROTECTION OF CHEMICAL INDUSTRY
11
石矍毡电极预处理模拟邻甲酚废水
武彦斌,王三反,张学敏,陈霞2
(1.兰州交通大学环境与市政工程学院寒旱区水资源综合利用教育部工程研究中心,甘肃兰州730070;
2.聊城大学建筑工程学院,山东聊城252059)
摘要]采用聚丙烯腈基石墨毡电极,以NaCl为电解质,在恒流电解的条件下,对质量浓度为1000mgL、COD=3672mgL的
模拟邻甲酚废水进行预处理。研究了电解时间、初始废水pH、NaCl加人量、电流密度对邻甲酚去除率的影响,考察了废水的
COD变化,并探讨了反应机理。实验结果表明:石墨毡电极具有较好的导电性、吸附性,对邻甲酚具有较好的电化学氧化性
能;常温常压下,初始废水pH为6-7、电流密度为90A/ma2、向300mL废水中加入0.5gNaC时,经4h电解,邻甲酚的去除率达
到97.1%,COD的去除率达到47.3%;处理后废水的 BOD/COD由0.04提高至0.33,可不经稀释直接进行生物处理。
[关键词]石墨毡电极;邻甲酚;电化学法;预处理
中图分类号]X703.1[文獻标志码」A[文章编号]1006-1878(2014)04-0311-05
Pretreatment of Simulated o-cresol-containing Wastewater with
Graphite Felt Electrode
Wu Yanbin Wang Sanfan, Zhang Xuemin, Chen Xia
(1. Engineering Research Center of Ministry of Education for Waer Resources Utilization in Cold and Droughty Region, School of
Environmental and Municipal Engineering, Lanzo J ao ong Unversity, Lanzhou Gansu 730070, China; 2. School of Architecture
and Civil Engineering, Liaocheng University, Liaocheng Shandong 252059, China)
Abstract: The simulated o-cresol-containing wastewater with 1 000 mg/L of o-cresol mass concentration
and 3 672 mg/L of COD was pretreated by constant-current electrolysis using the polyacrylonitrile based
graphite felt as electrode and Nacl as electrolyte. The factors affecting the o-cresol removal rate were
nvestigated, the changes of the wastewater COD were studied, and the reaction mechanism was discussed
The experimental results show that: The graphite felt electrode has a good conductivity, adsorbability and
electrochemical oxidation activity to o-cresol; Under the normal temperature and pressure, when the initia
wastewater PH is 6-7, the current density is 90 A/m", 0.5 g Nacl is added into 300 ml wastewater and
the electrolysis time is 4 h, the removal rate of o-cresol and COD are 97.1% and 47.3% respectively; The
BOD /COD is increased from 0.04 to 0.33, which indicates that the pretreated wastewater can be directly
treated by biological process without dilution
Key words: graphite felt electrode; o-cresol; electrochemical method; pretreatment
随着现代化工业的迅猛发展,大量含酚废水臭氧氧化法、光催化氧化法、电化学法等;生化法
对周围环境产生了严重的污染。含酚废水主要产自包括活性污泥法、厌氧一好氧法、固定化微生物
材料加工、石油化工、焦化、油漆生产、制药等行
业。酚类物质具有较高的毒性,是一种典型的“三[收積目期』2013-1120[像订日期)1014-05-15
作者简介]武彦斌(1989-),男,河北省城市人,硕士生,
致”物质,在污水排放行业标准中对其排放指标有
研究方向为水处理技术。电话18893702551,电邮 wybvsls@163
明确的规定。邻甲酚作为甲酚的一种异构体,具有com。联系人:王三反,电话0931-4938077,电邮 twangle62
准降解、毒性大等特点。目前,含酚废水的处理
Sina.como
主要采用物化法和生化法。物化法包括焚烧法、
基金项目]国家“十二五”科技支撑计划项目(2012BAFO3B06)。